Command Prompt Network Connectionedit

Identifies cmd.exe making a network connection. Adversaries can abuse cmd.exe to download or execute malware from a remote URL.

Rule type: query

Rule indices:

  • winlogbeat-*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum signals per execution: 100

Tags:

  • Elastic
  • Windows

Version: 2 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.7.0

Potential false positivesedit

Administrators may use the command prompt for regular administrative tasks. It’s important to baseline your environment for network connections being made from the command prompt to determine any abnormal use of this tool.

Rule queryedit

process.name:cmd.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 2 (7.7.0 release)

Updated query, changed from:

process.name:cmd.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:10.0.0.0/8 and not
destination.ip:172.16.0.0/12 and not destination.ip:192.168.0.0/16